Ore mill



ep 1940 R. E. MITZEL vom: MILL Filed June 17, 1939 3 Sheets-Sheet l R. E. MlTZEL Sept. 24. 1940.

ORE MILL Filed June 17. 1959 I 3 Sheets-Sheet 2 I .0 0A w i @1711 T. w J 4 INVENTOR.

ATTORNEY.

p 24, 1940- R. E. MITZEL ORE MILL Filed June 17, 1939 3 Sheets-Sheet 3 P INVENTOR.

ATTORNEY.

Patented Sept. 24, 1940 r UNITED STATES PATENT OFFICE ORE MLL Ruby E. Mitzel, Nevada City, Calif.

ApplicationJune 17, 1939, SerialNo. 279,594

1 Claim.

This invention relates to ore mills or crushers for use in mining operations.

Theprime object of the invention is to provide a simple, practical and efilcient ore pulverizing chored horizontally upon the base, a plurality of rollers journaled around the tramway inequispaced relation and with their peripheries extended above the upper face .of the tramway, a heavy annular tank or feed hopper rotatably mounted upon the said rollers, a hardened die ring in the bottom of the tank, a heavy operating shaft mounted across the top of the tank, supported for vertically reciprocating movement in the upper forked ends of a pair of spaced posts or bolsters permanentlyseated at their lower ends in the concrete base, a pair of heavy tired crusher rollers journaled at the ends of the shaft and riding upon the die ring within the tank, means additional to gravity for straining the rollers down upon the'die ring, means for conveying off the pulverized ore after treatment, and means for rotating the annular tank.

An apparatus well adapted for carrying out the foregoing objects is shown in the accompanying drawings, constituting part of this specification and wherein:

Figure 1 is a top plan view of the assembly constituting the invention.

Figure 2 is a vertical section, on the line 2-2 of Figure 1, the base however being shown in full lines.

Figure 3 is a side elevation.'

Figure 4 is an enlarged fragmental detail partly in section, showing the driving mechanism.

Figure 5 is a partial sectional view of the tank showing the discharge elements.

Figure 6 is a partial top plan view of the tank showing the discharge elements.

In carrying out the invention, I provide a suitably heavy concrete base 5, and mount thereon a heavy annular, double, track or tramway 6-fia by means of angular lugs 1 having one wing welded to the sides of the two spaced rails, and the other wing secured to bolts 8 anchored in the concrete base. The rails 6-60. are concentrically placed, the inner ne Gabeing of sufficiently smaller diameter to form an intervening roller space Ill, and within this space in equispaced relation therearound, are rotatably journaled. upon stub shafts II, a plurality of iron casters or rollers l2, with their peripheries projected somewhat above the track, as shown.

A suitably heavy, annular hopper or tank I4 is provided, the same being rectangular in cross section, and including a heavy iron bottom ring I5 and correspondingly heavy, iron side walls l6l'l. The side walls are secured to the bottom in any conventional manner, as by welding. A die or grinding ring l8 of hard steel is laid upon the bottom of the tank and upstanding, tapered lining rings l92ll are located around the inner faces of the sides of the tank, upon the die ring. Discharge ports 22 are cut through the lower margins of the outer wall IS in regularly spaced relation and are extended also through the outer lining l9. Screens 23 are mounted in these ports, and are inclosed outwardly at bottom and sides by outstanding flanges 24 secured to the outer face of the wall l6. These flanges serve to direct the discharge flow through the ports. The tank M is substantially greater in diameter than the tramway 6--6a, and so as to overlie the same both inwardly and outwardly, as clearly shown in Figure 2.

A heavy flanged, steel tread-ring 26 is rigidly welded to the under side of the bottom l5 of the tank, the same being of a diameter corresponding to that of the annular roller space H), and thus the caster wheels or rollers l2 are adapted to nicely engage this tread-ring. The depending flange 26a of this ring maintains the assembly in operative position at all times.

Inwardly of the ring 26, there is similarly mounted on the bottom I5 a heavy gear-ring 28, having depending gear teeth 29 tapered slightly upward and outward as shown.

A bearing block 3| is rigidly mounted through the tram-way 6--Ba. and a companion block 32 is supported atop a short pediment 33 embedded in the concrete base 5. Horizontally and radially aligned bores 34 are formed through these blocks, and a heavy drive shaft 35 is journaled through. A pinion 36 is rigidly mounted at the inner end of this shaft, the same having teeth 31 for meshing with the teeth 29 of the gear ring 28. A belt pulley 39 is rigidly joined to the outer end of the shaft. Thus means are afforded for rotating the tank l4 upon the casters or rollers l2. A pair of posts or bolsters 42 are mounted in diametrically spaced relation at opposite sides of the axis of the tank l4, the lower ends 42a being secured to bolts 40 embedded in the concrete base for firm anchorage. The upper ends of these posts carry forks 421). A heavy shaft 43 is located in these forks with the ends thereof extended partially across the tank Id at either side. Owing to the open forks 421) the shaft 43 may move up and down therein, for a purpose to be later pointed out. Heavy crusher rolls 44 are journaled upon the ends of this shaft, the rolls being disposed freely within each side of the tank I l and being of a size and diameter to contact and ride upon the bottom die ring l8. Key pins 45 passed through the shaft at either side of the rolls serve to hold the elements together in proper relation. The shaft 43 is enlarged centrally as shown at 43a, and a bore 43b is formed transversely therethrough. An anchor rod 46 is passed slidably down through this bore 43, the upper end of the rod being threaded as shown at 48a and the lower end being formed into a heavy hook 46b. A heavy iron loop 41 is seated at 47a in the concrete base 5 and the hook 46b is placed in engagement with this loop. A heavy coil spring 419 is placed freely over the upper end of the rod 36 and a nut 50 is turned down thereover, having a bearing upon a thimble washer 5!. Thus by turning down the nut 50 it is obvious that the rolls 44 will be pulled downwardly under a strong and resilient tensicn, and that the rolls M will exert corresponding pressure upon the ring H3. The rolls 44 are encased in tempered steel tires 52. A convenient construction for these rolls is to make them of reinforced concrete, as here shown.

In operation the crushed ore and water is fed into the tank 14 and the tank is rotated under power applied through the pulley 39. The heavy rolls 4% ride upon and over the ore, crushing and pulverizing same to a fineness adapted to pass through the screens 23 and out into receptacles for conveyance to other machines for further treatment.

The resilient mounting of the rolls enables same to readily adapt themselves to travel over any inequalities in the ore mass, or over metallic objects that may fall into the mass.

While I have herein set forth and described a particular embodiment of the invention, the right is claimed tomodify same in details not departing from the spirit of the invention as defined in the appended claim.

I claim:

In an apparatus of the kind described, a base, an annular double-railed tramway anchored horizontally on the base, a plurality of stubshafts mounted around the tramway with their ends seated in the rails of the tramway, rollers journaled on the said stub-shafts, an annular tank including a bottom ring and inner and outer annular side walls secured thereto, a grinding ring mounted in the tank upon the bottom thereof, tapered lining rings mounted in the tank around the inner faces of its sides, the said walls and lining rings being formed with discharge ports, a flanged tread-ring mounted on the under side of the tank bottom and seated freely upon the rollers of the tramway, a gear ring similarly mounted on the under side of the tank bottom inwardly of and concentrically with the tread ring, radially aligned and bored bearing blocks mounted one through the tramway and the other outwardly on the base, a shaft journaled through the bearing blocks, a pinion gear rigidly mounted on the inner end of the shaft in mesh with said gear ring, a pulley rigidly mounted on the outer end of the shaft, a pair of posts mounted through the open center of the tank in diametrically spaced relation at opposite sides of the axis of the tank, the posts being anchored in the base, forks at the upper ends of the posts opening upwardly, a crusher roll shaft located transversely and freely in said forks, the shaft being formed with a central vertical bore aligned with the tank axis, crusher rolls journaled on the ends of the shaft and disposed freely within each side of the tank to ride upon the bottom grinding ring, an anchor rod passed slidably down through the central bore of the crusher roll shaft, the rod being threaded at its upper and being tied at its lower end to the base, a coil spring mounted over the upper threaded end of the anchor rod, and a pressure adjustment nut threadedly mounted on the upper end of the anchor rod above the coil spring thereon, whereby the pressure of the crusher rolls upon the grinding ring may be regulated.

RUBY E. MITZEL. 

